Logic input circuit with energy transfer with input voltage matching
AssigneeSoprano
InventorsPatrick Piron, Richard Drevon, Olivier Francois
Life of this patent
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Abstract
A logic input circuit for an industrial equipment automatic control system supplied by a DC voltage source, in particular a battery (16), comprises a voltage step-up energy converter (12) composed of an inductance coil (L) and a switching transistor (TR), connected to the input (E1) of the circuit (10); a logic level detector (DL) having a optocoupler; and a clock circuit (H) controlling the transistor (TR) by adjusting the frequency or the duty cycle to perform voltage matching with the signals applied to the input (E1), and also the value of the voltage surge generated in logic high state (1) by the inductance coil (L) when switching of the transistor (TR) to the off state takes place.
Claims7
A logic input circuit for an industrial equipment automatic control system supplied by a DC voltage source, in particular a battery, said input circuit comprising means for detection designed to deliver a measurement signal representative of logic low state and of logic high state, comprising:
- a voltage step-up energy converter composed of an inductance coil and a switching transistor, connected to the input of the circuit,
- a logic level detector connected either between the inductance coil and a rectifier diode of an energy recovery circuit or between a charging resistor and the positive pole of the DC voltage source,
- and a dock circuit controlling switching of the transistor by adjustment of the frequency and duty cycle to perform voltage matching with the signals applied to the input, and also the value of the voltage surge generated in logic high state by the inductance coil when switching of the transistor to the off state takes place.
Dependencies are inferred from the claim text.